A versatile photodetector assisted by photovoltaic and bolometric effects

Abstract

The advent of low-dimensional materials with peculiar structure and superb band properties provides a new canonical form for the development of photodetectors. However, the limited exploitation of basic properties makes it difficult for devices to stand out. Here, we demonstrate a hybrid heterostructure with ultrathin vanadium dioxide film and molybdenum ditelluride nanoflake. Vanadium dioxide is a classical semiconductor with a narrow bandgap, a high temperature coefficient of resistance, and phase transformation. Molybdenum ditelluride, a typical two-dimensional material, is often used to construct optoelectronic devices. The heterostructure can realize three different functional modes: (i) the p–n junction exhibits ultrasensitive detection (450 nm–2 μm) with a dark current down to 0.2 pA and a response time of 17 μs, (ii) the Schottky junction works stably under extreme conditions such as a high temperature of 400 K, and (iii) the bolometer shows ultrabroad spectrum detection exceeding 10 μm. The flexible switching between the three modes makes the heterostructure a potential candidate for next-generation photodetectors from visible to longwave infrared radiation (LWIR). This type of photodetector combines versatile detection modes, shedding light on the hybrid application of novel and traditional materials, and is a prototype of advanced optoelectronic devices.

2D WS2 Based Asymmetric Schottky Photodetector with High Performance

“…[ 12,51 ] The reason is that the nearly ideal value γ of 0.99 ≈ 1 extracted from I ph = cP γ (see in Figure S11, Supporting Information) leads to an efficient process of photogenerated electron–hole pair generation and recombination. [ 56 ] The maximum EQE and D * under zero bias are about 238% and 4.94 × 10 11 Jones, respectively, at low light power density. The abnormal phenomenon of EQE > 100% in photovoltaic device probably due to the photoconductive gain effect formed by the interfacial trapped states.…”

Fabrication of a UV Photodetector Based on n-TiO2/p-CuMnO2 Heterostructures

“…Lately, sensory technology has evolved and is constantly growing to improve the quality of life and environmental protection. Hence, ZnO [2], TiO 2 [3], CuO/Cu 2 O [4], SnO/SnO 2 [5], and VO 2 /V 2 O 5 [6] are some examples of metal oxides and have been extensively studied for use as high-performance UV photodetectors [7]. These types of materials can have different structures, from nanowires to nanospheres, which have a direct influence on their performance in detection applications.…”

Recyclable Magnetic Cu/CuFe2O4 Nanocomposites for the Rapid Degradation of 4-NP

“…Therefore, the introduction of suitable nanocatalysts is vital in realizing the degradation of 4-NP. In the reaction system, BH 4 − ions generated by the ionization of NaBH 4 act as electron donors and hydrogen suppliers [44][45][46] Cu + in the presence of BH4 − anion. The changes of valence state between Cu + -Cu 2+ and Fe 2+ -Fe 3+ ion pairs in CuFe2O4 can enhance catalytic activity, which is the distinct advantage over CoFe2O4 and NiFe2O4 [48].…”